Lamp.



E. A. HAWTHORNE.

LAMP.

APPLICATION FILED 'NAY l9. I913.

Patented Nov. 21, 1916.

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LAME

Specification of Letters Patent.

Patented Nov. 21, 1831-64.

Application filed May 19, 1913. Serial No. 768,399.

To all whom it may concern:

Be it known that I, ELLSWORTH A. HAW- TI-IORNE, a citizen of the United States, and a resident of Bridgeport, county of Fairfield, State of'Connecticut, have invented an Improvement in Lamps, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to lamps, and more especially, though not exclusively, to electric lamps of the parabolic reflector type, and will be best understood by reference to the following specification, when taken in connection with the accompanying drawings of two illustrative embodiments thereof, while its scope will be more particularly pointed out in the appended claims.

In the drawings, Figure 1 is a side elevation of one form of lamp embodying my invention; Fig. 2 is a plan section on line 2-2 of Fig. 1; Fig. 3 is a detail plan section on an enlarged scale on line 3-3 of Fig. 1; Fig. i is a central vertical sectional view, showing the lamp with a modified form of bezel locking means; Fig. 5 is a front elevation on an enlarged scale, and partly broken away, illustrating the bezel lock shown in Fig. 4; and Fig. 6 is a sectional view on line 66 of Fig. 5, looking toward the left.

Referring to the drawings, and to the embodiment of my invention which I have selected for illustrative purposes, I have there shown a lamp comprising a lamp casing 7, consisting of a body portion 8 and a bezel 9, in which is mounted a light-transmitting closure in the form of a glass 10. Within the casing is a suitable lamp, herein an electric bulb 11, supported by a suitable reflector 12, which may be and preferably is of the parabolic type, and may be made of plated metal having "a highly polished reflecting and concentrating surface.

It is very essential that reflectors of this type should be protected are far as possible from moisture and dust, for the reason that their light-reflecting properties are greatly impaired by any accumulations of moisture and dust, and moreover, any attempt to wipe off such accumulations is bound to'lessen the brilliancy of the polished surface, and produce minute scratches thereon, which impair its light-reflecting properties. In order to protect the reflector from the entrance of moisture and dust, I have provided a packing of suitable material, against which the glass front is disposed, and means to retain the glass against the packing, thereby to insure a tight joint. A packing of rubber might beemployed for the purpose, but since the reflectors are usually plated with silver, the presence of rubber packing would be very apt to cause a blackening, or corrosion, of thesilvered surface by the fumes given off by rubber. I therefore prefer to employ a packing of suitable fibrous material, which will not chemically affect the silvered surface of the reflector. While the packing may be of any other suitable form, I have herein chosen to employ two packing rings 13 and 14, consisting of braided cotton cord impregnated with wax-like material, such for example as paraffin wax, which I have found to be best suited for this purpose, since it absorbs no moisture and yet is sufficiently soft to produce a dust and moisture tight oint. \Vhile the packing ring, or rings,'may be placed in any other suitable form of seat, herein the bezel 9 is provided with circumferential grooves 15 and 16, to receive the packing rings 13 and 14, respectively. (See particularly Fig. 3.) As shown in that figure the rings are preferably arranged so that one is disposed at the joint at the edge of the bezel and the other at the joint at the edge'of the glass. The glass may be held against these packing rings by any other suitable means, but herein I provide a split retaining ring 17, located in the' circumferential groove 18, and provided with inwardly projecting portions 19 overlying the inner face of the glass in such a These wire connections will be made suflivided w 2, and se vmg toprevent the rays of light from being directed upward. As a means for psi in. practice so that the reflector be swung forward on its hinge to per "pection and convenient repair of conlhe reflector may be locked in its normal position by any suit-able means, such the flange 28, and permit the reflector to be swung outward. I

The la r c may be, and preierably 1s, pro- ,n' hood 30, secured to, the bezel securing the bezel'to the casing, as well as insuring correct position of the hood, the body portion and bezel of the casing are Referring to Figs. i, 5 and 6, the bezel there I shown is provided with a plurality of lugs 36, passing through segmental slots 37 in a circumferential flange 38, and having slots rorming inclined arms so, engaging the rear face oi the flange 88, thereby to draw the bezel firmly against the body of the casing,

As a means for locking the parts of the Icasing in this position, the bezel may be preferably provided with suitable interlock ing means, constructed in such a manner as to lock the bezel against rotation. Such locking means may be, and preferably is, in the form of, a plurality of lugs" on one of the parts interlocked with the other part to permit one part to be rotated upon the other, thereby bringing the parts into position where they may be disengaged from each other. 'lo this end, in the form shown in Figs. 1, 2 and 3, the bezel 9 is provided with a circumferential groove 31, and the body portion 8 of the lamp cas ng 1s provided with two lugs 32, located in said groove and thusserving normally to prevent the bezel from being withdrawn. As a ltmeans for eilecting the connection and dis connection between the lugs 32 and the bezel 9, I provide the latter with one or more recesses or notches 33, as shown in Fig. 1. As there shown, the notch 33 is placed out of register with the lug 32, and may be locked in such relation'by suitable means to prevent the bezel 'fromturning upon the body of the lamp casing; While I may employ any other suitable means for this purpose, in the present instance, the body portion of the lamp casing 18 provided with a threaded ear, or lug, 34, which receives ascrew,35

passing through and threaded in the cir- ',cumferential wall of the bezel 9.

This provides a means for correctly til ( See Fig.

positioning the reflector 30, as well as normally retaining the lug 32 out of register with the notch or recess 33. When, however, it is desired to remove the bezel, this may be done by simply removing the screw 35, turning the bezel upon the body of the casing a short distance to bring the lug 32 into register with the notch 33, and then simply withdrawing the bezel in a forward direction.

provided witha laterally projecting lug 41, having an aperture 42 through which extends a spring arm 43, secured to the body. This springv arm is provided with a tooth 44, adapted to interengage with one of a series or" ratchet teeth 45 formed on the lug ll, thereby to lock the two parts of the casing against rotation. By pressing the spring arm 43 inwardly, its teeth may be disengaged from the tooth with which it is interlocked, and the two parts of the casing may be rotated one upon the other until the lugs 36 have been brought into register with the slots 37, whereupon the two parts of the casing may be separated by axial movement, one upon the other;

While I have herein shown and described two specific embodiments of my invention for illustrative purposes, and have disclosed and discussed in detail the construction and arrangement incidental to several specific applications thereof, it is to be understood that the invention is limited neither to the more details or relative arrangement of parts nor to its specific embodiments herein shown, but that extensive deviations from the illustrative forms or embodiments of the invention may be made,- without departing from the principles thereof.

Having thus described my invention, what I claim and desire by Letters Patentto pro cure is:

1. In a lamp, the combination of a lamp casing'having packing receiving grooves, a light transmitting closure for said casing, packings of suitable material in the grooves,

'against which packing the outer face of Said closure.-

the joint at the edge of the casing and the packing in the other that at the edge of the 2. InTa lamp, the combination of a lampcasin'g comprising a bodyv portion provided with laterally projecting lugs, a bezel swiveled upon said body portion and provided with a circumferential groove in which said name to this specification in the presence of lugs are normally located, and provided two subscribing Witnesses. with acrecess' through which one of said lugs may be Withdrawn, a threaded lug on said ELLSWORTH HAWTHORNE 5 body portion, and a screw passing through Witnesses: I

said bezel into said threaded lug. E. HORACE HAWTHORNE,

In testimony whereof, I have signed my VERONICA L. KELLEY. 

